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I often have the pleasure of introducing consultants to the mysteries of PKI. It s a subject I like talking about, and it s also great to be able to solve a problem in five minutes that the communications consultant has been working on for hours or perhaps days. Sometimes I am contracted to solve the problem, and sometimes I answer an inquiry from a reader. The latter was the case in this example. In this example, the problem concerned VPN connections between three sites of the same company. The problem is similar to one you will have to solve when deal ing with communications between multiple organizations. I was told that all three sites used exactly the same hardware and software and were configured in exactly the same manner by local administrators using a cen trally prepared instruction sheet. All three sites were part of the same company, but one site had been acquired six months previously. The purpose of the con nection was to create a site-to-site demand-dial VPN between all three sites using L2TP/IPSec as the communications protocol. The reader told me that the site-tosite demand-dial VPN between Sites A and B was working just fine, but neither A nor B were able to establish demand-dial connectivity with Site C. This informa tion, plus the requirement for L2TP/IPSec, was my first indication that the prob lem was trust related. I told the reader to switch to PPTP and see whether the VPN could be connected. He did, and it was. Here s how I explained why the solution worked.

Before taking the exam, review the key points and terms that are presented in this chapter. You need to know this information.

package org.jboss.ejb3.examples.ch18.tuner; import java.io.InputStream; /** * Local business interface of an EJB which * provides access to television streams * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> * @version $Revision: $ */ public interface TunerLocalBusiness { //--------------------------------------------------------------------------|| // Contracts ---------------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Obtains the stream containing viewable content * for the specified television channel. Supported channels are 1 and 2. * * @param channel * @return * @throws IllegalArgumentException If the channel is not valid */ InputStream getChannel(int channel) throws IllegalArgumentException; }

Global security groups are most often used to organize users who share similar network access requirements. Domain local security groups are most often used to assign permissions to resources. Universal security groups are most often used to assign permissions to related resources in multiple domains. You should place user accounts into global groups, create a domain local group for a group of resources to be shared in common, place the global groups into the domain local group, and then assign permissions to the domain local group. For global security groups, members come from only the local domain, but they can access resources in any domain. For domain local security groups, members can come from any domain, but they can access resources only in the local domain. For universal security groups, members can come from any domain in the forest and they can access resources in any domain in the forest.

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domain local group A security or distribution group often used to assign permis sions to resources. You can use a domain local group to assign permissions to gain access to resources that are located only in the same domain where you create the domain local group. In domains with the domain functional level set to Windows 2000 mixed, domain local groups can contain user accounts, computer accounts, and global groups from any domain. In domains with the domain functional level set to Windows 2000 native or Windows Server 2003, domain local groups can contain user accounts, computer accounts, global groups, and universal groups from any domain, and domain local groups from the same domain.

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package org.jboss.ejb3.examples.ch18.tuner; import import import import java.security.Identity; java.security.Principal; java.util.Properties; java.util.logging.Logger;

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